Filling system for a fountain pen

Abstract

A filling system for a fountain pen is proposed, which has a pump unit, an air channel connected with the pump unit and a first connection for connecting with the fountain pen, and an ink channel separate from the air channel and having an immersion end for immersion in ink, the ink channel being connected with a second connection for connecting with the fountain pen, wherein the pump unit is designed for introducing a predetermined air volume with overpressure into the air channel to flush ink out of the fountain pen and then applying a negative pressure to the air channel, so that a predetermined ink volume is sucked from the ink channel into the fountain pen.

Description

Technical Field

[0001] The invention relates to a filling system for a fountain pen, a writing instrument system comprising a filling system and a fountain pen, and a method for filling a fountain pen. Background Art

[0002] Fountain pens with an integrated ink cartridge with a piston are known. These pens are filled by dipping the nib into the ink reservoir and drawing in ink via a movable piston. The nib is moistened with ink during immersion, so the filling process always results in contamination of the nib with ink. Consequently, the nib must be cleaned repeatedly.

[0003] Sometimes, especially in the case of high-quality fountain pens, it is also meaningful to clean the ink guide channel to ensure continued perfect function. This can for example be achieved by utilizing liquid, for example distilled water to clean the fountain pen. Summary of the Invention

[0004] The object of the present invention is to provide an alternative filling system for a fountain pen, which allows the fountain pen to be filled as comfortably and cleanly as possible without contaminating the nib.

[0005] This object is achieved by a filling system for a fountain pen having the features of independent claim 1. Advantageous embodiments and developments are apparent from the dependent claims and the subsequent description.

[0006] A filling system for a fountain pen is proposed, comprising a pump unit, an air channel connected to the pump unit and a first connector for connecting to the fountain pen, and an ink channel separated from the air channel and having an immersion end for immersing ink, the ink channel being connected to a second connector for connecting to the fountain pen, wherein the pump unit is designed to introduce a predetermined volume of air with an overpressure into the air channel to flush ink out of the fountain pen, and then to apply a negative pressure to the air channel so that a predetermined volume of ink is sucked from the ink channel into the fountain pen.

[0007] Within the meaning of the present invention, a pump unit is understood to be a device designed to transport a fluid. As previously explained, this can particularly be air. It is useful to design the pump unit so that it can be placed on an ink container. The pump unit can therefore be implemented as an attachment to the ink container. However, other implementations are also conceivable, where the pump unit can be directly integrated into the ink container or its stopper. In other variations, the pump unit can simply be connected to the ink container and implemented separately. The ink container can, for example, be an ink barrel commonly used to fill fountain pens. It can be made of glass and have an opening that can be closed with a screw cap. The pump unit can, for example, be adapted to be placed on such an ink barrel with a screw-on cap. The pump unit can be connected to the external thread of the ink container, ensuring that the pump unit is securely fastened to the ink container during filling. Alternatively, it is also conceivable to equip the ink container directly with the pump unit, which is then permanently fastened to the ink container and, if necessary, can be closed with a cap. The pump unit can, for example, be pressed into or snapped into the ink glass opening.

[0008] It is assumed here that the fountain pen is connected to the air channel so that the first end or first section of the ink cartridge located in the fountain pen is fluidically connected to the first connector. The second end or second section of the ink cartridge, which is opposite the first end, can be fluidically connected to the ink channel. If air with an overpressure is introduced into the air channel, the ink located in the ink cartridge of the fountain pen is flushed out and enters the ink container connected to the pump unit through the ink channel. After the air volume is introduced, the ink cartridge is preferably completely emptied. By subsequently applying a negative pressure to the air channel, air is thus sucked back into the pump unit through the air channel. Through the connection to the ink cartridge of the fountain pen, ink is thus sucked from the ink channel into the ink cartridge. Ink flows into the ink cartridge through the ink channel and thus fills the ink cartridge. For this purpose, the ink channel has an immersion end, which is configured to be immersed in ink.

[0009] It is recommended to design the connector for connecting to the fountain pen as simply as possible. It can happen that the connector is designed, for example, as a small tube or tube end, onto which the corresponding connector of the fountain pen must be plugged for connection. It is therefore sufficient to plug the fountain pen onto the connector, for example, after opening the stopper or housing part, and to remove it again in the opposite direction after the filling process.

[0010] It is preferred that the air volume and the ink volume be coordinated with the filling volume of the ink cartridge so that the ink cartridge is completely filled. The filling system thus provides a very convenient and clean way to refill the ink cartridge of a fountain pen adapted for use with the filling system without having to immerse the fountain pen with the nib in the ink container.

[0011] The pump unit can be implemented mechanically or electrically. A mechanical embodiment can, for example, have a piston that moves relative to the pump. An electrical embodiment can, for example, be designed in the form of an electric metering pump.

[0012] In a particularly advantageous embodiment, the pump unit comprises a cylinder with a bottom section and an opening opposite the bottom section, a piston arranged axially displaceably in the cylinder, and a spring element which drives the piston in the direction of the opening, wherein an air channel extends from an air chamber formed between the piston and the bottom section through the piston, wherein an ink channel extends through the bottom section and the piston, wherein the piston is radially sealed relative to the cylinder, so that an overpressure is generated on the first connection by pressing the piston in the direction of the bottom section, and a negative pressure is generated on the first connection when the piston is released.

[0013] Air is introduced into the air channel by moving the piston in the cylinder. This can be done, for example, by pressing the piston in the direction of the bottom section, thereby reducing the air chamber there. The spring element is provided to move the piston in the other direction. The release of the piston can thus lead to an increase in the volume of the air chamber, thereby creating a negative pressure. As a result, air is sucked back into the air chamber through the air channel. Through a fluid connection to the ink channel provided in the fountain pen, ink thus flows back into the ink channel through the ink channel. The ink cartridge is thus filled. Preferably, the piston stroke and the volume difference of the air chamber are coordinated with the filling volume of the ink cartridge, so that the ink cartridge is completely filled.

[0014] The cylinder of the pump unit can have at least one cylindrical bore extending from the opening to a bottom section. The bottom section is understood here to be the lower section of the cylinder facing away from the opening. In simple cases, the bottom section can simply have a flat surface. In other cases, one or more flanges can also be provided, by which the inner diameter of the cylinder is at least partially reduced.

[0015] The piston has an outer diameter that is adapted to the inner diameter of the cylinder. In order to enable the piston to slide easily in the cylinder, a corresponding sliding adaptation can be provided for the piston and the cylinder. The inner wall of the cylinder can also have a sliding coating.

[0016] The spring element is designed to continuously apply force to the piston, thereby compressing it in the direction away from the bottom section. The spring element can, for example, be a compression spring arranged between the bottom section and the piston. Alternatively, the spring element can be a tension spring or other device arranged in the area of ​​the cylinder facing away from the bottom section, which in turn pulls the piston in the direction of the opening. The spring element can be made of metal, plastic, or a natural material, such as rubber. The compression spring can particularly be made of metal or plastic. Furthermore, the tension spring can also be made of rubber in the form of one or more tensioning elements. The spring element positions the piston in a neutral position, in which the user can connect tap water to the aforementioned connector, for example, by plugging it in. The user can then press the fountain pen in toward the bottom section, thereby initializing the filling system. By releasing the fountain pen, the compression spring returns the piston to its neutral position. Two channels are crucial for this function.

[0017] The air channel can extend from the first connection through the piston into the air chamber. Movement of the piston in the direction of the bottom section creates an overpressure in the air chamber due to the radial seal between the piston and the cylinder. Because the air channel opens into the air chamber, the overpressure enters the first connection via the air channel. It is provided that the fountain pen can be connected to the air channel and, for this purpose, include a small tube or other conduit extending into the ink cartridge of the fountain pen.

[0018] The ink channel can extend beyond the bottom section. If the pump unit is arranged on an ink container, for example, the ink channel can extend into the ink container, for example into the ink present therein. The ink channel can be connected to a second conduit of the fountain pen. The second conduit can preferably be fluidically connected to the first conduit, for example, via an ink cartridge arranged in the fountain pen. To this end, two connectors can be connected to opposite ends of the ink cartridge.

[0019] The immersion end is arranged so that it can protrude into the ink in the ink container. For example, the immersion end can extend from the piston through or through the bottom section. Other variations are also conceivable in which the immersion end does not pass through the bottom section but is guided differently. For this purpose, a flexible connecting line can be used, which runs with the piston at one end and is at least largely fixed at the opposite end.

[0020] In order not to form an overpressure in the ink container, a venting opening can be provided between the ink container and the pump unit, for example in the form of one or more openings. The opening can be realized as a slit or hole in the flange, with which the pump unit is located on the ink container.

[0021] In a preferred embodiment, the spring element is a compression spring and is arranged between the base section and the piston. The base section may have a depression or recess into which the end of the compression spring can be inserted. The piston may also have a recess, groove, or other recessed portion to accommodate the opposite end of the compression spring. The compression spring is particularly preferably a coil spring or conical spring that can move the piston away from the base section. Unwanted displacement of the piston is primarily prevented by a form-locking fit. The ends of the compression spring can be exposed and, for example, centered in the depression or other geometric feature by positioning. However, it is also possible to secure the spring element at both ends so that the piston cannot be pulled out or ejected from the cylinder. For example, the compression spring can be adhesively bonded on both sides. Preferably, its spring constant is adjusted so that the user can easily press the piston in without the compression spring encountering excessive resistance. Similarly, the compression spring should be strong enough to allow the user to easily insert a fountain pen into the connector without the piston moving.

[0022] In an advantageous embodiment, the piston has a first sealing body, which is arranged on the side pointing to the bottom section. The first sealing body can be designed in an annular manner, for example, and surround a part of the piston. The first sealing body can be connected to the piston in a form-locking manner, for example. However, adhesive bonding or other connections can also be feasible. The first sealing body can have an external radial projection, which contacts the inner wall surface of the cylinder. Instead of one or more projections, the entire first sealing body can also contact the inner wall of the cylinder in an aligned manner. The entire first sealing body can also contact the inner wall of the cylinder in an aligned manner. This reliably prevents air from the air chamber from escaping from the filling system through the piston. The sealing body can be made of natural or synthetic rubber or similar rubber material.

[0023] In an advantageous embodiment, the immersion end is guided axially and slidingly through a second sealing body arranged in the bottom section. Thus, the air chamber can be sealed in the area of ​​the bottom section without disrupting the fluid connection to the ink volume and the ink channel. In simple cases, the second sealing body can be a sealing ring with a rectangular, circular, or X-shaped cross-section. Other cross-sections are also conceivable.

[0024] Furthermore, outside the piston's neutral position, the sealing section of the immersion end is located within a second sealing body. The immersion end has an overflow section, which is arranged adjacent to the sealing section in the direction of the piston and, at least in part, features a tapered portion for guiding ink from the air chamber through the bottom section. In the neutral position, the overflow section is located within the second sealing body and, therefore, does not provide a seal relative to the immersion end when the piston is in its neutral position. In the neutral position, the piston is pressed toward the opening by the spring element. Ink in the air chamber can flow from the bottom section through the overflow section into the ink reservoir. This may be necessary, for example, when filling a fountain pen and excessive ink is drawn from the ink reservoir due to the piston stroke, causing some ink to flow completely through the ink cartridge and into the air line. Ink then enters the air chamber and can flow out from there. If the piston is pressed toward the bottom section, the sealing section is covered by the second sealing body, and the air chamber is sealed again to generate the excess pressure required for the filling process.

[0025] In order to ensure that the ink cartridge is always filled, the volume of the air cavity may be larger than the volume of the ink cartridge to be filled.

[0026] Particularly preferably, the first connector and the second connector can be arranged concentrically with each other. Therefore, the user cannot incorrectly insert the fountain pen onto the first and second connectors, because every rotational position is suitable for establishing the connection.

[0027] Furthermore, the first connector can be arranged inside the second connector and extend beyond the second connector. This can facilitate the placement of the fountain pen and achieve sufficient separation of the two connectors.

[0028] In an advantageous embodiment, the first and second connections are arranged in an introduction sleeve, which is arranged on the side of the piston facing away from the air chamber. The introduction sleeve can protrude from the upper side of the piston or be formed therein. The upper side can be considered to be the side of the cylinder opposite the bottom section. The introduction sleeve allows for simple and intuitive introduction of the fountain pen into the filling system.

[0029] At least one third sealing body can be arranged between the introduction sleeve and the piston. The third sealing body allows sealing the corresponding pipelines of the fountain pen to the two joints. However, the third sealing body can also be a part of the fountain pen.

[0030] It is also advantageous if the first section of the immersion end, which is arranged on the side of the base section facing away from the air chamber, has a larger outer diameter than the second section, which is arranged in the air chamber when the piston is in the neutral position. The larger outer diameter allows for the formation of a flange that can, for example, abut against the base section from below, i.e., from the side facing away from the air chamber. However, additional bodies, such as seals or spacers, can also be located between the base section and the first section of the immersion end. If the piston and immersion end are designed and adapted to each other, accidental withdrawal of the piston and alignment of the piston with the opening can be prevented.

[0031] In one embodiment, the air channel and the ink channel can be arranged in the piston at least partially radially offset from each other. The guidance of air and ink in the piston can thus be simplified.

[0032] Advantageously, the cylinder has a flange on its outer side for aligning the cylinder with the edge of the ink container's opening. This allows for a harmonious fit between the cylinder and the ink container, particularly in high-quality ink containers. It is also conceivable that the cylinder is adapted to be fastened directly to the ink container using a threaded ring. The filling system and the ink container then form a coherent unit. An additional cap can then be screwed onto the opening.

[0033] The present invention also relates to a writing instrument system having a filling system according to the above description and a fountain pen, wherein the fountain pen has a clutch device and an ink cartridge with a first segment and a second segment, wherein the clutch device is connected to the first segment and the second segment and can be connected to a first connector and a second connector, so that a fluid connection can be established between the first connector and the first segment and between the second connector and the second segment.

[0034] The present invention also relates to a method for filling a fountain pen, comprising the following steps: connecting a first connection of a pump unit to a first connection of at least one ink cartridge in the fountain pen, connecting a second connection of the pump unit to a second connection of at least one ink cartridge in the fountain pen, immersing the second connection in ink in an ink container, introducing air with an overpressure into the first connection to empty residual ink in the at least one ink cartridge into the ink container via the second connection, and generating a negative pressure at the first connection to draw ink into the at least one ink cartridge via the second connection.

[0035] As explained above, this allows the ink cartridge in a fountain pen to be completely filled. Due to the overpressure, the remaining amount of ink is transported from the ink cartridge via the second connection. The subsequent provision of negative pressure, however, causes ink to be drawn into the ink cartridge via the second connection. For this purpose, the first connection can be connected to a pump unit designed to provide air with overpressure and subsequently provide negative pressure. If the first section and the second section are located at opposite ends of the ink cartridge, the entire volume of the ink cartridge located between them can be filled with ink. It can also be provided that at least one ink cartridge also represents more than one interconnectable ink cartridge. The first section and the second section can be arranged at opposite ends of the entire arrangement of ink cartridges, so that the entire arrangement of ink cartridges can be filled with ink using the aforementioned method.

[0036] Similar to the previous embodiment, the introduction of air and the generation of negative pressure can be carried out by a pump unit having a cylinder and an axially movable and spring-loaded piston therein, which is pressed by the user to introduce air and released to generate negative pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Further features, advantages, and possible applications of the present invention are apparent from the following description of exemplary embodiments and the accompanying drawings. All features described and / or shown in the drawings, individually and in any combination, also independently of their combination in the individual claims or their references, form the subject matter of the present invention. Furthermore, in the drawings, identical reference numerals represent identical or similar objects.

[0038] Figure 1 The filling system is shown in cross-section.

[0039] Figure 2 and Figure 3a Ink container and filling system shown, without ( Figure 2 ) and has ( Figure 3a ) placed on the fountain pen.

[0040] Figure 3b The equipment for a fountain pen using a filling system is shown schematically.

[0041] Figure 4 and Figure 5 The process of placing a fountain pen onto the filling system is shown.

[0042] Figure 6 The overflow in the filling system is shown in detail. DETAILED DESCRIPTION

[0043] Figure 1The filling system 2 for a fountain pen 4 is shown. The filling system 2 has a pump unit 6 which can be placed onto an ink container 8. The pump unit 6 has a cylinder 10 with a bottom section 12 and an opening 14 opposite the bottom section 12.

[0044] An axially displaceable piston 16 is located in the cylinder 10. The piston has, for example, a radial projection 18 in certain areas, which can slide in a groove 20 in the cylinder 10. This ensures that the cylinder 16 is torsionally fixed.

[0045] A first sealing body 24 is arranged on the underside 22 of the piston 16. This first sealing body is connected to the piston 16 in a form-fitting manner. To this end, the first sealing body 24 has a circumferential radial groove 26, into which a circumferential radial projection 28 of the piston 16 extends. The first sealing body 24 has two annular, radially circumferential sealing lips 30 that are spaced apart from one another and that form a surface contact with an inner wall 32 of the cylinder 10. This creates an air chamber 34 between the bottom section 12 and the underside of the piston 16, in which air is pressurized by the movement of the piston 16.

[0046] exist Figure 1 In the middle, the piston 16 is in a neutral position in which it is essentially aligned with the opening 14 of the cylinder 10. A compression spring 36 is located between the bottom section 12 and the piston 16, which constantly pushes the piston 16 back into the neutral position. The compression spring is designed, for example, as a coil spring.

[0047] An air channel 38 extends from the air chamber 34 through the piston to a first connector 40. This first connector can be designed as a small tube. A separate ink channel 42 extends through the bottom section 12 and the piston 16 to a second connector 44. The second connector is preferably designed concentrically with the first connector 40, with the openings of the two connectors spaced apart from each other. The opening of the first connector 40 extends beyond the opening of the second connector 44. However, this can also be reversed.

[0048] The ink channel 42 has an immersion end 46 that protrudes from the piston 16. The immersion end 46 is designed to extend into the ink container 8, in which a volume of ink is located. If the piston 16 is pressed by the user in the direction of the bottom section 12, the volume of the air chamber 34 decreases. To compensate for the air pressure, air can flow into the air channel 38 and from there be directed to the first connection 40. An air line 46 of the fountain pen 4 is provided there and is fluidically connected to the air channel 38, so that air from the air channel 38 flows there.

[0049] The ink cartridge (not shown here) of the fountain pen 4 is connected to the air line 46 and is also fluidically connected to the ink line 48. Furthermore, residual ink from the ink cartridge of the fountain pen 4 is directed to the second connection 44 and thus to the ink channel 42. This ink then flows into the ink container 8. When the piston 16 is released, a negative pressure is generated in the air channel 38 due to the piston 16 being pushed back into the neutral position, thereby drawing ink into the ink cartridge via the fluid connection with the ink line 48 and the ink channel 42. Thus, the fountain pen 4 can be filled by simply inserting it into the filling system 2, pressing in the piston 16, and then releasing it.

[0050] The immersion end 46 is guided axially and slidingly through a second sealing body 50 integrated into the bottom section 12. This allows the air chamber 34 to be sealed relative to the ink container 8. The immersion end has a larger diameter in a first section 52 of the immersion end 46 than in a second section 54, which is arranged on the side of the immersion end 46 facing the piston 16. This forms a kind of flange 56, by which the immersion end 46 can rest in an aligned manner against the second sealing body 50 or an additional stop 58.

[0051] The cylinder 10 has a flange 62 on the outside 60 for placing the cylinder 10 in an aligned manner on the opening edge 64 of the ink container 8. The part of the cylinder 10 that projects into the ink container 8 has an outer diameter that is adapted to the inner diameter of the ink container 8, so that the cylinder 10 is located in the ink container 8 with as little play as possible.

[0052] The fountain pen 4 has, by way of example, two third sealing bodies 66 , through which the first connection 40 and the second connection 44 extend when the fountain pen 4 is plugged into a new system 2 . The sealing bodies can also be part of the filling system 2 .

[0053] Figure 2 The filling system 2 is shown on an ink container 8. A threaded ring 68 is provided here to fasten the filling system 2 on the ink container 8. For this purpose, the ink container 8 has a thread 70 (see also Figure 1 ). In order to simplify the guidance of the fountain pen 4 onto the filling system 2, the filling system has an introduction sleeve 72 extending out of the opening 14. If the fountain pen 4 is inserted, a connection with the connectors 40 and 44 can be established.

[0054] exist Figure 3a In FIG. 4 , it can be seen how the connection process of the fountain pen 4 and the filling system 2 is realized. This will be described in detail in the following Figure 4 and Figure 5 There, the fountain pen 4 has two third sealing bodies 66, which are Figure 4 The position in is not yet connected to the two connectors 40 and 44. Figure 5In the embodiment of the present invention, the fountain pen 4 is inserted into the filling system 2 in an aligned manner so that the lower edge 74 of the fountain pen 4 abuts against the receiving surface 76 of the filling system. Subsequently, the piston 16 can be pressed down to start the filling process.

[0055] Figure 3b An ink cartridge 82 is shown very schematically and includes a first section 84 and a second section 86, which in this example are arranged at opposite ends of the ink cartridge 82. The first section 84 can be connected to an air line 88, and the second section 86 can be connected to an ink line 90. The air line 88 and the ink line 90 can be combined in a clutch device 92, which can be coupled to the first connection 40 and the second connection 44. Thus, the air line 88 and the first connection 40 are connected to each other, and the ink line 90 and the second connection 44 are connected to each other. The illustration is schematic. The clutch device 92 can also be provided with a concentric arrangement of the two lines 88 and 90.

[0056] Figure 6 Finally, the immersion end 46 is shown to have an overflow section 78. This overflow section is arranged adjacent to the sealing section 54 in the direction of the piston 16 and is located in the second sealing body 50, so that in the neutral position of the piston 16, the gap is open. When the piston 16 is actuated, the sealing section 54 moves into the second sealing body 50, thereby sealing the air chamber 34. The overflow section 78 has a taper at least in sections, so that ink can flow from the air chamber 34 through the bottom section 12 and into the ink reservoir via the overflow section 78. If excess ink is drawn from the ink reservoir 8 into the ink line 48 when filling the fountain pen 4, ink can enter the air chamber 34 and flow out again if the piston 16 has not yet returned to its neutral position.

[0057] In addition, it should be noted that "having" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. Furthermore, it should be noted that features described with reference to one of the above embodiments can also be used in combination with other features of other embodiments described above. Reference numerals in the claims should not be construed as limiting.

[0058] Reference numerals

[0059] 2 Filling system

[0060] 4 fountain pens

[0061] 6 Pump units

[0062] 8 ink containers

[0063] 10 cylinders

[0064] 12 bottom section

[0065] 14 Opening

[0066] 16 pistons

[0067] 18. Radial protrusion of the piston

[0068] 20 slots

[0069] 22 lower side

[0070] 24 First sealing body

[0071] 26 radial slots

[0072] 28 surrounding protrusions

[0073] 30 Radial sealing lip

[0074] 32 inner wall

[0075] 34 air cavity

[0076] 36 Compression spring

[0077] 38 air channels

[0078] 40 First joint

[0079] 42 ink channels

[0080] 44 Second connector

[0081] 46 Immersion tip

[0082] 48 ink lines

[0083] 50 Second sealing body

[0084] 52 First Segment

[0085] 54 Second Section

[0086] 56 flange

[0087] 58 stopper

[0088] 60 outside

[0089] 62 flange

[0090] 64 Opening edge

[0091] 66 Third sealing body

[0092] 68 threaded ring

[0093] 70 thread

[0094] 72 Import sleeve

[0095] 74 lower edge

[0096] 76 Accommodation surface

[0097] 78 overflow section

[0098] 80 Sealing section

[0099] 82 ink cartridges

[0100] 84 First Segment

[0101] 86 Second segment

[0102] 88 air line

[0103] 90 ink line

[0104] 92 Clutch

Claims

1. A filling system (2) for a fountain pen (4), comprising: Pump unit (6), an air passage (38) connected to the pump unit (6) and a first connector (40) for connecting to the fountain pen (4), and an ink channel (42) separated from the air channel (38) and having an immersion end (46) for immersing ink, the ink channel being connected to a second connector (44) for connecting to a fountain pen (4), in, The pump unit (6) is designed to introduce a predetermined volume of air with overpressure into the air channel (38) to flush ink out of the fountain pen (4), and then apply negative pressure to the air channel (38) so that the predetermined volume of ink is sucked into the fountain pen (4) from the ink channel (42).

2. Filling system (2) for a fountain pen (4) according to claim 1, in, The pump unit (6) is mechanical or electric.

3. Filling system (2) according to claim 1 or 2, in, The pump unit (6) comprises a cylinder (10) with a bottom section (12) and an opening (14) opposite the bottom section (12), a piston (16) arranged axially displaceably in the cylinder (10), and a spring element (36) which drives the piston (16) in the direction of the opening (14). wherein the air passage (38) extends from an air chamber (34) formed between the piston (16) and the bottom section (12) through the piston (16), wherein the ink channel (42) extends through the bottom section (12) and the piston (16), The piston (16) is radially sealed relative to the cylinder (10), so that by pressing the piston (16) in the direction of the bottom section (12), an overpressure is generated on the first connection (40), and when the piston (16) is released, a negative pressure is generated on the first connection (40).

4. Filling system (2) according to claim 3, wherein The spring element (36) is a compression spring and is arranged between the bottom section (12) and the piston (16).

5. Filling system (2) according to claim 3, wherein The piston (16) has a first sealing body (24) which is arranged on the side facing the bottom section (12).

6. Filling system (2) according to claim 3, wherein The immersion end (46) is guided axially slidingly through a second sealing body (50) arranged in the bottom section (12).

7. Filling system (2) according to claim 6, wherein Outside the neutral position of the piston (16), the sealing section (80) of the immersion end (46) is located in the second sealing body (50), wherein the immersion end (46) has an overflow section (78) which is arranged adjacent to the sealing section (80) in the direction of the piston (16) and has at least partially a tapering portion for guiding ink from the air chamber (34) through the bottom section (12).

8. The filling system (2) according to claim 1, wherein The first joint (40) and the second joint (44) are arranged concentrically with each other.

9. Filling system (2) according to claim 8, wherein The first joint (40) is arranged inside the second joint (44) and extends beyond the second joint (44).

10. The filling system (2) according to claim 3, wherein The first connection (40) and the second connection (44) are arranged in an introduction sleeve (72) which is arranged on the side of the piston (16) facing away from the air chamber (34).

11. The filling system (2) according to claim 9, wherein At least one third sealing body (66) is arranged between the introduction sleeve (72) and the piston (16).

12. The filling system (2) according to claim 1, wherein The first joint (40) and the second joint (44) are arranged concentrically with respect to each other.

13. The filling system (2) according to claim 3, wherein A first section (52) of the immersion end (46) arranged on the side of the bottom section (12) facing away from the air chamber (34) has a larger outer diameter than a second section (54) which is arranged in the air chamber (34) in the neutral position of the piston (16).

14. The filling system (2) according to claim 3, wherein The air channel (38) and the ink channel (42) are arranged in the piston (16) at least partially in a radially offset manner relative to each other.

15. The filling system (2) according to claim 3, wherein The cylinder (10) has a flange (62) on its outer side for placing the cylinder (10) on the opening edge (64) of the ink container (8) in an aligned manner.

16. A writing instrument system comprising a filling system (2) according to any one of the preceding claims and a fountain pen (4), wherein: The fountain pen (4) comprises a coupling device (92) and at least one ink cartridge (82) having a first section (84) and a second section (86), wherein the coupling device (92) is connected to the first section (84) and the second section and can be connected to a first connector (40) and a second connector (44), so that a fluid connection can be established between the first connector (40) and the first section (84) and between the second connector (44) and the second section (86).

17. A method for filling a fountain pen (4), comprising the following steps: A first connector (40) of the pump unit is connected to a first section of at least one ink cartridge in a fountain pen (4), and a second connector (44) of the pump unit (6) is connected to a second section of at least one ink cartridge in a fountain pen (4). Immerse the second joint (44) in the ink in the ink container, Air with overpressure is introduced into the first connection (40) to empty the residual ink in at least one ink cartridge into the ink container via the second connection (44), and Negative pressure is generated on the first joint (40) to draw ink into at least one ink core via the second joint (44).

18. The method according to claim 17, wherein: The introduction of air and the generation of negative pressure are carried out by a pump unit (6), which has a cylinder (10) and a spring-loaded piston (16) which is axially displaceable therein and is pressed by a user to introduce air and released to generate negative pressure.

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